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(1) (Digital Video Recorder) A device that records video from up to a dozen or more surveillance cameras onto a hard disk. The frame rate can be switched from real time to time lapse in order to save storage space. Digital recorders are more flexible than earlier analog VHS tape systems, and the video can be easily transmitted over a computer network. See CCTV.

(2) (Digital Video Recorder) Also known as a "personal video recorder" (PVR) or "hard disk recorder," a DVR is a consumer device that allows the viewer to pause and rewind any broadcast, cable or satellite TV program as well as record and play back selected programs (see live pause). An order of magnitude more flexible than earlier videocassette tape recorders (VCRs), an entire season of programs from one or more favorite series can be recorded.

DVRs may be built into the set-top box or replace the box using plug-in modules (see CableCARD). They store incoming digital TV signals on the hard disk as well as digitize analog TV into the MPEG-2 format. The video may be compressed to maximize storage space.

Part of the Service or Stand-Alone
The DVR periodically downloads channel program guide updates as well as software updates for the unit itself. When the DVR is integrated into the cable or satellite set-top box, the downloads ride the same medium as the TV service. When the DVR is stand-alone, the downloads come in via the home network.

Before the Turn of the Century
DVRs first came on the market in 1999 with products from ReplayTV and TiVo ( They quickly made the VCR obsolete for timeshifting TV programs, and Tivo became the DVR leader. ReplayTV was later acquired by SONICblue, D&M Holdings and eventually the DirecTV satellite TV service ( See cloud DVR, multi-room DVR sharing, live pause, DVD recorder and networked DVR. Contrast with NVR.

This earlier DVR from ReplayTV appears in front of the Find Shows screen, which enables a viewer to search for programming throughout the week by keyword. (Image courtesy of ReplayTV.)
References in periodicals archive ?
Browse Hard disk recorder (HDR) Market Report spread through 150 Pages at http://www.
Combined Sky box and hard disk recorder is brilliantly simple to use.
MediaGiantPro is a high definition network media player and hard disk recorder in one solution that comes with integrated powerline technology to record, stream and play high definition movies photos and music anywhere in the home.
In a demonstration CD (available from our web site) a vintage acoustic guitar was recorded with a famous studio condenser mic going thru high quality studio gear to a hard disk recorder and then was compared to the MXL USB.
Sony HVR-V1U 24p HDV camcorder with HVR-DR60 60GB hard disk Recorder
The V2O's wireless decoder delivers the superior television signal of CanalDigitaal throughout a home up to four stories high, and is equipped with a hard disk recorder (PVR), full electronic programming guide (EPG) and an intuitive user interface.
has chosen several of ADI's leading signal processing solutions to power the video and audio signal chains in the industry's first hard disk recorder with high-definition (HD) DVD.
Sky again demonstrated flair for innovation with the introduction in 2001 of the next-generation integrated digital satellite set-top box and personal video hard disk recorder, Sky+.
New Hitachi products for 2006 will include Plasma and LCD televisions with built-in HD recording functionality via an internal hard disk recorder.
Besides its free service tvtv enables remote programming of PC based Hard disk Recorder and Personal Video Recorder via Internet and Mobile Phone.
Schlomka stated, "We are very pleased COMO will soon be joining FOCUS Enhancements, as the combination creates a complete product suite from the FireStore Digital Hard Disk Recorder to our Media Management Server System to the Visual Circuits' Playout Solutions.
The Cocoon series is an advanced line of Sony products including a hard disk recorder (HDD) with PVR functionality.